Flame arrester

Abstract

The utility model discloses a flame arrester, which relates to the technical field of torpedo ladle baking and comprises a medium pipeline, a gas nozzle is arranged in the medium pipeline, a flame arresting slingshot is further arranged in the medium pipeline, the cross section area of the flame arresting slingshot is smaller than that of the inner wall of the medium pipeline, and the flame arresting slingshot comprises a slingshot frame, a slingshot rod, a spring and a plug. The slingshot frame is fixed in the medium pipeline, the slingshot rod is sleeved in the slingshot frame, one end of the slingshot rod is brazed with the slingshot frame, the other end of the slingshot rod is fixed with the plug, the spring is sleeved on the slingshot rod, the spring is arranged between the slingshot frame and the plug, the plug is aligned with the gas nozzle, and the slingshot rod, the plug and the gas nozzle are coaxially arranged. According to the flame arrester, flame propagation can be effectively prevented, meanwhile, system resistance is basically not increased, normal flow and pressure of a pipeline system are not affected, the structure is simple, the installation and maintenance process is convenient and fast, and manufacturing, using and maintaining cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of torpedo ladle baking, in particular to a flame arrester. Background Art

[0002] The principle of the existing flame arrester in the torpedo ladle baking assembly is mainly based on the phenomenon that when a flame passes through a narrow pore or channel, it extinguishes due to heat loss. Specifically, a flame arrester usually consists of many small, uniform or non-uniform channels or pores, and the sizes of these channels or pores are designed to be as small as possible so that only the flame can pass through; when the flame enters the flame arrester, it is divided into many small flame streams; because the heat transfer area of these channels or pores is very large, heat exchange occurs when the flame passes through the channel wall, resulting in a significant temperature drop; when the temperature drops to a certain degree, the combustion conditions of the flame are no longer met, so the flame is extinguished.

[0003] However, such dense and narrow pore channels increase the system resistance loss while preventing the spread of the flame, which will affect the normal flow rate and pressure of the pipeline system. Summary of the Utility Model

[0004] In view of the above deficiencies currently existing, the utility model provides a flame arrester, which can effectively prevent the spread of the flame, basically does not increase the system resistance, does not affect the normal flow rate and pressure of the pipeline system, has a simple structure, is convenient and fast in the installation and maintenance process, and greatly reduces the manufacturing, use and maintenance costs.

[0005] To achieve the above object, the embodiments of the utility model adopt the following technical solutions:

[0006] A flame arrester includes a medium pipeline, a gas nozzle is arranged in the medium pipeline, and a flame arrester slingshot is also arranged in the medium pipeline. The cross-sectional area of the flame arrester slingshot is smaller than the cross-sectional area of the inner wall of the medium pipeline. The flame arrester slingshot includes a slingshot frame, a slingshot rod, a spring and a plug. The slingshot frame is fixed in the medium pipeline. The slingshot rod is sleeved in the slingshot frame. One end of the slingshot rod is brazed to the slingshot frame and the other end is fixed to the plug. The spring is sleeved on the slingshot rod and is arranged between the slingshot frame and the plug. The plug is aligned with the gas nozzle, and the slingshot rod, the plug and the gas nozzle are coaxially arranged.

[0007] According to one aspect of the utility model, the width and the heights at both ends of the flame arrester slingshot are smaller than the inner diameter of the medium pipeline.

[0008] According to one aspect of the utility model, the slingshot frame is provided with elastic protrusions and through holes. The slingshot frame is in extrusion fit with the inner wall of the medium pipeline through the elastic protrusions. The slingshot rod is inserted into the through holes. The through holes, the slingshot rod, the plug and the gas nozzle are coaxially arranged.

[0009] According to one aspect of the present utility model, the slingshot frame includes an upper frame plate, a lower frame plate, end plates, a left reinforcing plate, and a right reinforcing plate. The upper frame plate and the lower frame plate are arranged in parallel. Both ends of the end plates are respectively fixed to the ends of the upper frame plate and the lower frame plate. The left reinforcing plate and the right reinforcing plate are both fixed between the upper frame plate and the lower frame plate, and the end plates, the left reinforcing plate, and the right reinforcing plate are spaced apart from each other.

[0010] According to one aspect of the present utility model, the elastic protrusions are respectively arranged on the upper frame plate and the lower frame plate, and the through holes sequentially penetrate through the end plates, the left reinforcing plate, and the right reinforcing plate from left to right.

[0011] According to one aspect of the present utility model, an auxiliary positioning structure is further arranged in the medium pipeline. The auxiliary positioning structure includes a V-shaped structure and a retaining piece. The retaining piece is fixed inside the V-shaped structure. One end of the slingshot frame is arranged inside the V-shaped structure and is in contact connection with the retaining piece.

[0012] According to one aspect of the present utility model, the V-shaped structure includes two groups of arc-shaped protrusions. The two groups of arc-shaped protrusions are arranged in a V shape and fixed inside the medium pipeline, and the retaining piece is fixed between the two groups of arc-shaped protrusions.

[0013] According to one aspect of the present utility model, an auxiliary gas inlet and a premixed gas outlet are respectively communicated at both ends of the medium pipeline, and a gas inlet is communicated at one end of the gas nozzle.

[0014] According to one aspect of the present utility model, a guiding groove is further arranged in the medium pipeline, and the slingshot frame enters the medium pipeline along the guiding groove for fixed installation.

[0015] According to one aspect of the present utility model, the medium pipeline is a circular pipe, the gas nozzle is in an L shape, the slingshot frame is a square frame, the slingshot rod is a circular rod, the plug is hemispherical, and the guiding groove is in a U shape.

[0016] Advantages of the implementation of the present utility model: When backfire occurs in the medium pipeline, the brazed part between the slingshot rod and the slingshot frame is heated and melted. Subsequently, the spring pushes the slingshot rod to extend relative to the slingshot frame, causing the plug to block the gas nozzle, thereby closing the gas passage and preventing the spread of flames. In this way, compared with the existing flame arresters, this product can effectively prevent the spread of flames while basically not increasing the system resistance and not affecting the normal flow rate and pressure of the pipeline system. Since the cross-sectional area of the fire arrest slingshot is smaller than the cross-sectional area of the inner wall of the medium pipeline, the pipeline in this product will not be affected in terms of normal flow rate and pressure, and the system resistance is basically not increased. By setting elastic protrusions and the slingshot frame being in extrusion fit with the inner wall of the medium pipeline through the elastic protrusions, the installation and maintenance process of this product is convenient and fast. The fire arrest slingshot of this product is a disposable device. When backfiring, only the fire arrest slingshot is damaged, and the external equipment is not damaged. During maintenance, a new fire arrest slingshot can be conveniently replaced, and the external pipelines can all continue to be used, greatly reducing the use and maintenance costs of the overall equipment. The overall structure of this product is simple, easy to disassemble, assemble, manufacture and process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a three-dimensional perspective structure schematic diagram of the present utility model;

[0019] Figure 2 is a sectional structure schematic diagram of the present utility model;

[0020] Figure 3 is a three-dimensional sectional structure schematic diagram of the present utility model;

[0021] Figure 4 is a structure schematic diagram of the fire arrest slingshot of the present utility model.

[0022] The names corresponding to the serial numbers in the figure are as follows:

[0023] 1, medium pipeline; 11, premixed gas outlet; 12, combustion-supporting gas inlet; 2, gas nozzle; 21, gas inlet; 3, fire arrest slingshot; 4, slingshot frame; 41, upper frame plate; 42, lower frame plate; 43, end plate; 44, left reinforcing plate; 45, right reinforcing plate; 5, slingshot rod; 6, spring; 7, plug; 8, brazing material; 9, arc-shaped protrusion; 10, retaining piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "one side", "the other side", "front", "rear", "middle part", "inside", "top end", "bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0025] Embodiment 1

[0026] As Figures 1-4 shown, a flame arrester is installed in a torpedo ladle roaster or used in any baking equipment. This flame arrester includes a medium pipeline 1, a gas nozzle 2, and a flame arrester slingshot 3. The medium pipeline 1 is a circular pipe, and a premixed gas outlet 11 and an auxiliary gas inlet 12 are respectively provided at its left and right ends. The auxiliary gas inlet 12 is used as an intake connection port for the combustion-supporting gas. The premixed gas outlet 11 is used as the outlet for the mixture of gas and auxiliary gas. The auxiliary gas and gas respectively enter the medium pipeline 1 through the auxiliary gas inlet 12 and the gas nozzle 2 for premixing, and the mixture of the auxiliary gas and gas flows out through the premixed gas outlet 11. The gas nozzle 2 extends into the medium pipeline 1. The gas nozzle 2 is used as the outlet for the combustible gas jet. Both the gas nozzle 2 and the auxiliary gas inlet 12 are located at the right end of the medium pipeline 1. The end of the gas nozzle 2 is connected to a gas inlet 21. The gas inlet 21 vertically penetrates the medium pipeline 1 integrally. The gas inlet 21 is used as the intake connection port for the combustible gas. The overall structure of the gas nozzle 2 is in an L shape, and the outlet end of the gas nozzle 2 is hemispherical. The gas enters through the gas inlet 21 and then flows into the medium pipeline 1 through the gas nozzle 2. The flame arrester slingshot 3 is fixed in the medium pipeline 1 and is used to block the gas transmission. The flame arrester slingshot 3 includes a slingshot frame 4, a slingshot rod 5, a spring 6, and a plug 7. The slingshot frame 4 is fixed in the medium pipeline 1. The slingshot rod 5 is sleeved in the slingshot frame 4. One end of the slingshot rod 5 is brazed to the slingshot frame 4, and the other end is fixed to the plug 7. The spring 6 is sleeved on the slingshot rod 5, and the spring 6 is arranged between the slingshot frame 4 and the plug 7. The plug 7 is aligned with the gas nozzle 2. Under normal conditions, that is, during normal operation, the spring 6 is in a compressed state. When flashback occurs in the medium pipeline 1, the brazed part between the slingshot rod 5 and the slingshot frame 4 is heated and melted. Subsequently, the spring 6 pushes the slingshot rod 5 to extend relative to the slingshot frame 4, so that the plug 7 blocks the gas nozzle 2, thereby closing the gas passage and preventing the flame from spreading.

[0027] In this embodiment, the cross-sectional area of the entire fire-resistant slingshot 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1. Or rather, the width of the fire-resistant slingshot 3 and the heights of its left and right ends are both smaller than the inner diameter of the medium pipeline 1. Thus, compared with the structural setting of traditional pipeline flame arresters (blocking the entire pipeline and only leaving several small pores or channels for the passage of flames), when this product works normally, the fire-resistant slingshot 3 will not impede the flow of gas in the medium pipeline 1, that is, it basically does not increase the system resistance and does not affect the normal flow rate and pressure of the pipeline system.

[0028] In this embodiment, elastic protrusions are provided at the middle positions of the upper and lower ends of the slingshot frame 4; when the slingshot frame 4 is inserted into the medium pipeline 1, the slingshot frame 4 can be squeezed and clamped with the inner wall of the medium pipeline 1 through the elastic protrusions, so that the slingshot frame 4 is firmly attached to the inner wall of the medium pipeline 1, that is, the slingshot frame 4 is fixedly installed in the medium pipeline 1.

[0029] In this embodiment, the slingshot frame 4 has a square frame structure, which includes an upper frame plate 41, a lower frame plate 42, end plates 43, a left reinforcing plate 44, and a right reinforcing plate 45, all of which are square plate-shaped; the upper frame plate 41 and the lower frame plate 42 have the same structure and are arranged parallel to each other up and down; the end plates 43 are arranged vertically, and the upper and lower ends thereof are integrally and perpendicularly connected to the left end of the upper frame plate 41 and the left end of the lower frame plate 42 respectively; the left reinforcing plate 44 and the right reinforcing plate 45 have the same structure and are arranged parallel to each other left and right, and both are vertically fixed between the upper frame plate 41 and the lower frame plate 42 for supporting and strengthening the structure. The middle positions of the upper frame plate 41 and the lower frame plate 42 bulge outwards and have a certain elasticity. Or rather, the elastic protrusions are respectively arranged at the middle positions of the upper frame plate 41 and the lower frame plate 42; the left and right ends of the upper frame plate 41 and the lower frame plate 42 are flat, and the middle positions are V-shaped plate-shaped or arc-shaped plate-shaped. Through holes are provided on the slingshot frame 4, and the through holes sequentially penetrate through the central positions of the end plates 43, the left reinforcing plate 44, and the right reinforcing plate 45 from left to right; the slingshot rod 5 is in a round rod shape and is inserted into the through holes; the slingshot rod 5 (plug 7), the through holes, and the gas nozzle 2 are coaxial, and the manufacturing precision is strictly controlled to avoid poor closing. The left end of the slingshot rod 5 is welded to the end plate 43 through a brazing material 8, and the right end of the slingshot rod 5 is integrally fixed to the plug 7; the spring 6 is arranged between the right reinforcing plate 45 and the plug 7. The width of the slingshot frame 4 and the heights of its left and right ends are both smaller than the inner diameter of the medium pipeline 1, so that it is convenient to insert or extract the slingshot frame 4 from the medium pipeline 1 for disassembly and assembly; the slingshot frame 4 with a square frame structure has a simple structure and is easy to manufacture and process.

[0030] In this embodiment, an auxiliary positioning structure is further provided in the medium pipeline 1. The auxiliary positioning structure is used to assist in the positioning and installation of the slingshot frame 4 in the medium pipeline 1. There are two groups of auxiliary positioning structures, which are fixed in the medium pipeline 1, one above the other. The gas outlet end of the gas nozzle 2 is located between the two groups of auxiliary positioning structures. The auxiliary positioning structure includes a V-shaped structure and a baffle 10. The V-shaped structure is used to fix the installation orientation of the flame arrestor slingshot 3, and the baffle 10 is used to limit the installation depth of the flame arrestor slingshot 3. The baffle 10 is fixed inside the V-shaped structure, and the right end of the slingshot frame 4 is arranged inside the V-shaped structure and is in contact connection with the baffle 10. The V-shaped structure includes two groups of arc-shaped protrusions 9. The arc-shaped protrusions 9 are semi-cylindrical, and the two groups of arc-shaped protrusions 9 are arranged in a V shape and fixed in the medium pipeline 1. The baffle 10 is fixed between the two groups of arc-shaped protrusions 9. The right ends of the upper frame plate 41 and the lower frame plate 42 respectively extend between the two groups of arc-shaped protrusions 9 (so as to ensure that the entire flame arrestor slingshot 3 is in the installation orientation in the middle of the medium pipeline 1, and also ensure the alignment of the flame arrestor slingshot 3 or the plug 7 with the gas nozzle 2), and are in contact and fit with the baffle 10 (so as to limit the height or depth of the entire flame arrestor slingshot 3 installed inside the medium pipeline 1).

[0031] In this embodiment, the plug 7 is hemispherical, and its structural shape is adapted to the structural shape of the gas outlet end of the gas nozzle 2, so that it is convenient for the plug 7 to block the gas nozzle 2; the spherical structure of the plug 7 can make the seal more tight. The slingshot frame 4 and the slingshot rod 5 are used as brazing base materials, and are made of stainless steel 304 material, and the melting point temperature is about 1400 °C; the brazing material 8 is a silver-based brazing material 8, and the melting point temperature is selected to be 600-800 °C. In this way, it can not only ensure the welding strength between the left end of the slingshot rod 5 and the end plate 43 of the slingshot frame 4 and be firmly connected without tempering, but also ensure the fusing effect; when tempering occurs, the flame temperature is much higher than the melting point temperature of the welding material, so that the flame arrestor slingshot 3 can quickly act to achieve the flame arrest function and protect other equipment from being affected. The selection of the brazing material 8 should be matched with the normal working temperature and the combustion flame temperature of the mixed gas, and it is necessary to ensure the structural stability during normal operation and the rapid heating and fusing when the mixed gas has a backfire; the selection of the elastic modulus of the spring 6 and the design of the compression amount of the spring 6 are determined according to factors such as the installation position of the flame arrestor slingshot 3 and the relative positions of the gas nozzle 2 and the auxiliary positioning structure.

[0032] The principle of this embodiment is as follows: when a backfire occurs in the medium pipeline 1, the brazing part between the slingshot rod 5 and the slingshot frame 4 is heated and fused, disconnecting the connection between the left end of the slingshot rod 5 and the slingshot frame 4. Subsequently, the compressed spring 6 returns to its free extension state, thereby pushing the slingshot rod 5 to pop out relative to the slingshot frame 4, so that the plug 7 at the right end of the slingshot rod 5 blocks the gas nozzle 2, and the two form a perfect spherical seal, thus closing the gas passage and preventing the flame from spreading.

[0033] The beneficial effects of this embodiment are as follows: Compared with the existing flame arresters, this product can effectively prevent the spread of flames while basically not increasing the system resistance and not affecting the normal flow rate and pressure of the pipeline system. Since the cross-sectional area of the flame arrestor slingshot 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1, the pipelines in this product will not be affected in terms of normal flow rate and pressure, and the system resistance is basically not increased. By setting elastic protrusions, the slingshot frame 4 is in extrusion fit with the inner wall of the medium pipeline 1 through the elastic protrusions, that is, the flame arrestor slingshot 3 is connected to the external medium pipeline 1 through a simple mechanical fit, making the installation and maintenance process of this product convenient and fast. The flame arrestor slingshot 3 of this product is a disposable device. During backfire, only the flame arrestor slingshot 3 is damaged, and the external equipment is not damaged. When overhauling, a new flame arrestor slingshot 3 can be conveniently replaced, and the external pipelines can all continue to be used, greatly reducing the use and maintenance costs of the overall equipment. The overall structure of this product is simple, easy to disassemble, assemble, manufacture and process, with low cost and high economy.

[0034] Embodiment 2

[0035] A flame arrester is installed in a torpedo ladle roaster or used in any baking equipment; this flame arrester includes a medium pipeline 1, a gas nozzle 2, and a flame arrestor slingshot 3. The medium pipeline 1 is a circular pipe, and its left and right ends are respectively provided with a premixed gas outlet 11 and a combustion-supporting gas inlet 12; the combustion-supporting gas inlet 12 is used as a combustion-supporting gas intake connection port; the premixed gas outlet 11 is used as the outlet of the mixture of gas and combustion-supporting gas; the combustion-supporting gas and gas respectively enter the medium pipeline 1 through the combustion-supporting gas inlet 12 and the gas nozzle 2 for premixing, and the mixture of the combustion-supporting gas and gas flows out through the premixed gas outlet 11. The gas nozzle 2 extends into the medium pipeline 1, and the gas nozzle 2 is used as a combustible gas jet outlet. Both the gas nozzle 2 and the combustion-supporting gas inlet 12 are located at the right end of the medium pipeline 1; a gas inlet 21 is connected to the end of the gas nozzle 2, and the gas inlet 21 vertically penetrates the medium pipeline 1 integrally, and the gas inlet 21 is used as a combustible gas intake connection port; the overall structure of the gas nozzle 2 is in an L shape, and the outlet end of the gas nozzle 2 is hemispherical; the gas enters through the gas inlet 21 and then flows into the medium pipeline 1 through the gas nozzle 2. The flame arrestor slingshot 3 is fixed in the medium pipeline 1 and is used to block the gas transmission; the flame arrestor slingshot 3 includes a slingshot frame 4, a slingshot rod 5, a spring 6, and a plug 7. The slingshot frame 4 is fixed in the medium pipeline 1, the slingshot rod 5 is sleeved in the slingshot frame 4, one end of the slingshot rod 5 is brazed to the slingshot frame 4, and the other end is fixed to the plug 7. The spring 6 is sleeved on the slingshot rod 5, and the spring 6 is arranged between the slingshot frame 4 and the plug 7, and the plug 7 is aligned with the gas nozzle 2. Under normal conditions, that is, during normal operation, the spring 6 is in a compressed state; when backfire occurs in the medium pipeline 1, the brazed part between the slingshot rod 5 and the slingshot frame 4 is heated and melted, and then the spring 6 pushes the slingshot rod 5 to extend relative to the slingshot frame 4, so that the plug 7 blocks the gas nozzle 2, thereby closing the gas passage and preventing the spread of flames.

[0036] In this embodiment, the overall cross-sectional area of the flame arrester slingshot 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1. Or rather, the width of the flame arrester slingshot 3 and the heights of its left and right ends are both smaller than the inner diameter of the medium pipeline 1. Thus, compared with the structural setting of traditional pipeline flame arresters (blocking the entire pipeline and only leaving several small pores or channels for the passage of flames), the flame arrester slingshot 3 will not impede the flow of gas in the medium pipeline 1 during the normal operation of this product, that is, it basically does not increase the system resistance and does not affect the normal flow rate and pressure of the pipeline system.

[0037] In this embodiment, elastic protrusions are provided at the middle positions of the upper and lower ends of the slingshot frame 4; when the slingshot frame 4 is inserted into the medium pipeline 1, the slingshot frame 4 can be squeezed and clamped with the inner wall of the medium pipeline 1 through the elastic protrusions, so that the slingshot frame 4 is firmly attached to the inner wall of the medium pipeline 1, that is, the slingshot frame 4 is fixedly installed in the medium pipeline 1.

[0038] In this embodiment, the slingshot frame 4 has a square frame structure, which includes an upper frame plate 41, a lower frame plate 42, end plates 43, a left reinforcing plate 44, and a right reinforcing plate 45, all of which are in the shape of square plates; the upper frame plate 41 and the lower frame plate 42 have the same structure and are arranged parallel to each other up and down; the end plates 43 are arranged vertically, and the upper and lower ends thereof are integrally and perpendicularly connected to the left end of the upper frame plate 41 and the left end of the lower frame plate 42 respectively; the left reinforcing plate 44 and the right reinforcing plate 45 have the same structure and are arranged parallel to each other left and right, and both are perpendicularly fixed between the upper frame plate 41 and the lower frame plate 42 for supporting and strengthening the structure. The middle positions of the upper frame plate 41 and the lower frame plate 42 bulge outwards and have a certain elasticity. Or rather, the elastic protrusions are respectively arranged at the middle positions of the upper frame plate 41 and the lower frame plate 42; the left and right ends of the upper frame plate 41 and the lower frame plate 42 are in the shape of flat plates, and the middle positions are in the shape of V-shaped plates or arc-shaped plates. Through holes are provided on the slingshot frame 4, and the through holes sequentially penetrate through the central positions of the end plates 43, the left reinforcing plate 44, and the right reinforcing plate 45 from left to right; the slingshot rod 5 is in the shape of a round rod and is inserted into the through holes; the slingshot rod 5 (plug 7), the through holes, and the gas nozzle 2 are coaxial, and the manufacturing precision is strictly controlled to avoid poor closure. The left end of the slingshot rod 5 is welded to the end plate 43 through a brazing material 8, and the right end of the slingshot rod 5 is integrally fixed to the plug 7; the spring 6 is arranged between the right reinforcing plate 45 and the plug 7. The width of the slingshot frame 4 and the heights of its left and right ends are both smaller than the inner diameter of the medium pipeline 1, so that it is convenient to insert or extract the slingshot frame 4 from the medium pipeline 1 for disassembly and assembly; the slingshot frame 4 with a square frame structure has a simple structure and is easy to manufacture and process.

[0039] In this embodiment, an auxiliary positioning structure is further provided in the medium pipeline 1. The auxiliary positioning structure is used to assist in the positioning and installation of the slingshot frame 4 in the medium pipeline 1. There are two sets of auxiliary positioning structures, which are fixed in the medium pipeline 1, one above the other. The gas outlet end of the gas nozzle 2 is located between the two sets of auxiliary positioning structures. The auxiliary positioning structure includes a V-shaped structure and a baffle 10. The V-shaped structure is used to fix the installation orientation of the flame arrester slingshot 3, and the baffle 10 is used to limit the installation depth of the flame arrester slingshot 3. The baffle 10 is fixed inside the V-shaped structure, and the right end of the slingshot frame 4 is arranged inside the V-shaped structure and is in contact connection with the baffle 10. The V-shaped structure includes two sets of arc-shaped protrusions 9. The arc-shaped protrusions 9 are semi-cylindrical, and the two sets of arc-shaped protrusions 9 are arranged in a V shape and fixed in the medium pipeline 1. The baffle 10 is fixed between the two sets of arc-shaped protrusions 9. The right ends of the upper frame plate 41 and the lower frame plate 42 respectively extend between the two sets of arc-shaped protrusions 9 (so as to ensure that the entire flame arrester slingshot 3 is in the installation orientation in the middle of the medium pipeline 1, and can also ensure the alignment of the flame arrester slingshot 3 or the plug 7 with the gas nozzle 2), and are in contact and fit with the baffle 10 (so as to limit the height or depth of the installation of the entire flame arrester slingshot 3 inside the medium pipeline 1). The baffle 10 can abut against the right end faces of the upper and lower frame plates to perform the limit function.

[0040] In this embodiment, the plug 7 is hemispherical, and its structural shape is adapted to the structural shape of the gas outlet end of the gas nozzle 2, so it is convenient for the plug 7 to block the gas nozzle 2. The spherical structure of the plug 7 can make the seal more airtight. The slingshot frame 4 and the slingshot rod 5 are used as brazing base materials, and are made of stainless steel 304 material, and the melting point temperature is about 1400 °C. The brazing material 8 is a silver-based brazing material 8, and the melting point temperature is selected to be 600-800 °C. In this way, it can not only ensure the welding strength between the left end of the slingshot rod 5 and the end plate 43 of the slingshot frame 4, and be firmly connected without tempering, but also ensure the fusing effect. When tempering occurs, the flame temperature is much higher than the melting point temperature of the welding material, so that the flame arrester slingshot 3 can quickly act to achieve the flame arrester function and protect other equipment from being affected. The selection of the brazing material 8 should be matched with the normal working temperature and the combustion flame temperature of the mixed gas, and it is necessary to ensure the structural stability during normal operation and the rapid heating and melting during the tempering of the mixed gas. The selection of the elastic modulus of the spring 6 and the design of the compression amount of the spring 6 are determined according to factors such as the installation position of the flame arrester slingshot 3 and the relative positions of the gas nozzle 2 and the auxiliary positioning structure.

[0041] In this embodiment, a guiding groove (not shown in the figure) is further provided in the medium pipeline 1, and the slingshot frame 4 enters the medium pipeline 1 along the guiding groove for fixed installation. The guiding groove is a U-shaped groove, and there are two groups, symmetrically arranged one above the other at the middle position inside the medium pipeline 1. The guiding groove extends from the left end of the medium pipeline 1 to the front of the auxiliary positioning structure; the slingshot frame 4 (or the entire flame arrester slingshot 3) can be inserted into or withdrawn from the medium pipeline 1 along the guiding groove. Thus, the guiding groove not only facilitates the disassembly and assembly guiding of the flame arrester slingshot 3, but also can play an auxiliary role in the installation and positioning of the flame arrester slingshot 3.

[0042] The principle of this embodiment is as follows: When backfire occurs in the medium pipeline 1, the brazed part between the slingshot rod 5 and the slingshot frame 4 is heated and melted, disconnecting the connection between the left end of the slingshot rod 5 and the slingshot frame 4. Subsequently, the compressed spring 6 resumes its free expansion state, thereby pushing the slingshot rod 5 to pop out relative to the slingshot frame 4, so that the plug 7 at the right end of the slingshot rod 5 blocks the gas nozzle 2, and the two form a perfect spherical seal, thus closing the gas passage and preventing the spread of flames.

[0043] The beneficial effects of this embodiment are as follows: Compared with the existing flame arresters, this product can effectively prevent the spread of flames while basically not increasing the system resistance and not affecting the normal flow rate and pressure of the pipeline system. Since the cross-sectional area of the flame arrester slingshot 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1, the pipeline in this product will not be affected in terms of normal flow rate and pressure, and the system resistance is basically not increased. By setting elastic protrusions and the slingshot frame 4 being in extrusion fit with the inner wall of the medium pipeline 1 through the elastic protrusions, that is, the flame arrester slingshot 3 is connected to the external medium pipeline 1 through simple mechanical cooperation, the installation and maintenance process of this product is convenient and fast. The flame arrester slingshot 3 of this product is a disposable device. During backfire, only the flame arrester slingshot 3 is damaged, and the external equipment is not damaged. During maintenance, a new flame arrester slingshot 3 can be conveniently replaced, and the external pipelines can all continue to be used, greatly reducing the use and maintenance costs of the overall equipment. By setting the guiding groove, this product is convenient for disassembly, assembly and positioning. The overall structure of this product is simple, easy to disassemble, assemble, manufacture and process, with low cost and high economy.

[0044] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A flame arrester, comprising a medium pipeline (1), wherein a gas nozzle (2) is arranged in the medium pipeline (1), and is characterized in that, A fire - stopping slingshot (3) is also provided inside the medium pipeline (1). The cross - sectional area of the fire - stopping slingshot (3) is smaller than the cross - sectional area of the inner wall of the medium pipeline (1). The fire - stopping slingshot (3) includes a slingshot frame (4), slingshot rods (5), springs (6), and plugs (7). The slingshot frame (4) is fixed inside the medium pipeline (1). The slingshot rods (5) are sleeved inside the slingshot frame (4). One end of the slingshot rod (5) is brazed to the slingshot frame (4), and the other end is fixed to the plug (7). The springs (6) are sleeved on the slingshot rods (5), and the springs (6) are arranged between the slingshot frame (4) and the plug (7). The plug (7) is directly opposite and aligned with the gas nozzle (2). The slingshot rod (5), the plug (7), and the gas nozzle (2) are coaxially arranged.

2. The flame arrester according to claim 1, wherein The width and the heights at both ends of the fire - stopping slingshot (3) are smaller than the inner diameter of the medium pipeline (1).

3. The flame arrester according to claim 2, characterized in that, Elastic protrusions and through - holes are provided on the slingshot frame (4). The slingshot frame (4) is in extrusion fit with the inner wall of the medium pipeline (1) through the elastic protrusions. The slingshot rods (5) are inserted into the through - holes. The through - holes, the slingshot rods (5), the plugs (7), and the gas nozzles (2) are coaxially arranged.

4. The flame arrester according to claim 3, characterized in that, The slingshot frame (4) includes an upper frame plate (41), a lower frame plate (42), end plates (43), a left reinforcing plate (44), and a right reinforcing plate (45). The upper frame plate (41) and the lower frame plate (42) are arranged in parallel. The two ends of the end plates (43) are respectively fixed to the ends of the upper frame plate (41) and the lower frame plate (42). The left reinforcing plate (44) and the right reinforcing plate (45) are both fixed between the upper frame plate (41) and the lower frame plate (42). The end plates (43), the left reinforcing plate (44), and the right reinforcing plate (45) are spaced apart from each other.

5. The flame arrester according to claim 4, characterized in that, The elastic protrusions are respectively arranged on the upper frame plate (41) and the lower frame plate (42). The through - holes penetrate through the end plates (43), the left reinforcing plate (44), and the right reinforcing plate (45) in sequence from left to right.

6. The flame arrester according to claim 1, characterized in that, An auxiliary positioning structure is also provided inside the medium pipeline (1). The auxiliary positioning structure includes a V - shaped structure and a baffle (10). The baffle (10) is fixed inside the V - shaped structure. One end of the slingshot frame (4) is arranged inside the V - shaped structure and is in contact connection with the baffle (10).

7. The flame arrester according to claim 6, characterized in that, The V - shaped structure includes two groups of arc - shaped protrusions (9). The two groups of arc - shaped protrusions (9) are arranged in a V - shape and fixed inside the medium pipeline (1). The baffle (10) is fixed between the two groups of arc - shaped protrusions (9).

8. The flame arrester according to claim 1, characterized in that, Both ends of the medium pipeline (1) are respectively communicated with an oxidant inlet (12) and a premixed gas outlet (11). One end of the gas nozzle (2) is communicated with a gas inlet (21).

9. The flame arrester according to claim 1, characterized in that, A guiding groove is also provided inside the medium pipeline (1). The slingshot frame (4) enters the medium pipeline (1) along the guiding groove for fixed installation.

10. The flame arrester according to claim 9, characterized in that The medium pipeline (1) is a circular pipe. The gas nozzle (2) is in an L - shape. The slingshot frame (4) is a square frame. The slingshot rod (5) is a round rod. The plug (7) is hemispherical. The guiding groove is in a U - shape.

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